Ford Focus St-3 Mk3 Expansion Tank Radiator Reservoir 2.0 Petrol CV61-8K218-BC

Ford Focus St-3 Mk3 Expansion Tank Radiator Reservoir is an original cooling system component designed for use with a petrol-powered engine. This used expansion tank ensures a factory fit, stable operating parameters, and allows for an economical yet professional repair of the cooling system in the sporty Focus ST-3 version.

Specifications and technical data

• SKU: CV61-8K218-BC
• Mark: Ford
• Condition: Used
• OEM Part Number: CV61-8K218-BC
• Substitutable numbers: CV61-8K218-BC, CV618K218BC, 1774289
• Fuel type: Petrol
• Part type: Coolant Expansion Tank
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank belongs to the Expansion Tanks category and is responsible for compensating for coolant volume changes and maintaining stable system pressure. A correctly selected component of this type is crucial for the engine's thermal safety, reduces the risk of overheating, and facilitates coolant level monitoring. The version dedicated to the 2.0 petrol engine in the Focus ST-3 Mk3 has been designed for the specific operating parameters of the powertrain, ensuring compatibility with the factory thermostat, radiator, and hoses without the need for system modifications.

Benefits of using an original expansion tank

Using an original expansion tank in the sporty variant of the Focus translates into:

• secure fitment to factory mounts and cooling system hoses,
• maintenance of the pressure characteristics designed by the manufacturer,
• easy monitoring of the coolant level,
• reduced risk of leaks resulting from the imprecise fit of aftermarket replacements. For users who drive dynamically, including under conditions of increased thermal load, such a cooling system component is an important point in service maintenance and stable engine operation.

Product characteristics and fitment

The offered expansion tank is a used part, which allows for a cost-effective restoration of cooling system efficiency while maintaining the original design. The component is intended for use with a petrol engine, ensuring its geometry, connection ports, and working volume are adapted to the specifics of this powertrain. The product comes from the line of original Ford components, which facilitates selection based on factory service documentation and manufacturer catalogs. The presence of the OEM part number and interchangeable numbers in the technical specification allows for additional verification of compatibility with a specific vehicle configuration.

Application in service practice

Replacing the expansion tank is recommended in cases such as visible micro-cracks, signs of leaks, problems with maintaining pressure, or after engine overheating. Installing an original component in a Focus ST-3 Mk3 with a 2.0 petrol engine restores proper coolant circulation and facilitates subsequent diagnostics of potential leaks. Due to the factory fit, the installation process is predictable and does not require mounting adaptations or hose modifications, which shortens workshop time and reduces the risk of installation errors.

Expanding the Ford cooling system

If you are planning a comprehensive repair or upgrade of the cooling system area in your Ford and need other elements from the same group, such as additional tanks, mounting elements, or caps, check the available parts in the Ford Expansion Tanks category.

Support for interior equipment selection

If you are simultaneously thinking about improving cabin comfort and want to better plan your investment in used components, practical tips on choosing seats, steering wheels, and multimedia can be found in the article Premium interior for half the price: second-hand seats, steering wheels, and multimedia.